How and why does population change over time and space?
Population change, the demographic transition model, the causes and consequences of migration, and the management of population issues.
A focused CCEA A-Level Geography answer on population, covering the components of population change, the demographic transition model, population structure, the causes and consequences of migration, and population policy, with located Northern Ireland, EU enlargement and global examples.
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What this dot point is asking
CCEA wants you to explain the components of population change, apply and evaluate the demographic transition model, interpret population structure, account for the causes and consequences of migration, and assess population policies, using located examples such as Northern Ireland and post-2004 EU migration.
Components of population change
Natural change is the difference between the birth rate and the death rate; total change also depends on net migration. Falling death rates and then falling birth rates drive the long-term decline in population growth as countries develop.
Population structure
Age-sex pyramids show the proportion of males and females in each age band. A wide base indicates a youthful population with high birth rates (stage two); a top-heavy pyramid indicates an ageing population (stages four and five). Northern Ireland, like much of the UK, has an ageing structure: the 2021 Census recorded around of people aged and over, raising the dependency ratio and pressure on health and pensions.
Migration
Managing population issues
Countries use population policies to manage growth or decline: anti-natalist policies to slow growth (China's former one-child policy), pro-natalist policies to raise birth rates in ageing societies (France's family benefits), and managed migration to address labour shortages or skill gaps.
Examples in context
Example 1. Post-2004 EU enlargement migration to Northern Ireland. When eight Central and Eastern European states joined the EU in 2004, Northern Ireland received significant inward migration, especially Polish and Lithuanian workers, who filled labour shortages in agri-food processing (for example Dungannon and Portadown), construction and services. The 2021 Census recorded Polish as the most common non-UK and non-Irish nationality. Benefits included a younger workforce and economic growth; pressures included demand for English-language support, school places and housing. It shows migration reshaping a local population.
Example 2. Japan's ageing and declining population (stage five). Japan has one of the world's oldest populations, with over aged and over and a total fertility rate around , well below the replacement level of . The population is shrinking, straining pensions, health and the workforce. Responses include encouraging later retirement, robotics in care, and cautious immigration. Japan illustrates stage five of the DTM and the challenges of managing decline and ageing.
Try this
Q1. Define the term natural change. [2 marks]
- Cue. The difference between the birth rate and the death rate in a population.
Q2. Explain two consequences of an ageing population. [4 marks]
- Cue. A rising dependency ratio, greater pressure on health and pension spending, and a shrinking workforce.
Q3. With reference to a located example, explain the causes of an international migration. [6 marks]
- Cue. Post-2004 EU migration to Northern Ireland; push factors (unemployment in source) and pull factors (jobs, free movement, services).
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA 20196 marksDescribe the changes in birth rate and death rate through the stages of the demographic transition model.Show worked answer →
Worth 6 marks. Markers reward the rates and the gap between them at each stage, linking them to natural change.
Stage 1 (high fluctuating): birth and death rates both high (around 35 per 1000) and fluctuating, so natural change is small.
Stage 2 (early expanding): death rate falls sharply with better food, water and medicine while birth rate stays high, so rapid growth.
Stage 3 (late expanding): birth rate now falls (contraception, lower infant mortality, female education) while death rate is low, so growth slows.
Stage 4 (low fluctuating): both rates low (around 10 per 1000), so population is steady.
Stage 5 (declining): death rate slightly exceeds a very low birth rate, so natural decrease, as in parts of Europe and Japan.
CCEA 20229 marksWith reference to a located example, discuss the consequences of international migration for source and destination areas.Show worked answer →
Worth 9 marks. Discuss needs balanced costs and benefits for both areas plus a judgement, with located detail.
Destination (for example the UK and Northern Ireland after 2004 EU enlargement): gains include filling labour shortages in agri-food and construction, a younger workforce and cultural diversity; costs include pressure on housing, schools and health services and some social tension.
Source (for example Poland): benefits include reduced unemployment and large remittance flows; costs include loss of young, skilled workers (brain drain) and an ageing population left behind.
Judgement: migration brings clear economic benefits to destinations and remittances to sources, but the loss of young workers and local service pressures mean the balance depends on scale and management.
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Sources & how we know this
- CCEA GCE Geography specification — CCEA (2016)